Dead-pulley rig



(No Model.) 2 Sheets-Shestl l.

H. C. GROWELL.

i DEAD PULLEY RIG. No. 289,073. Patented Nov. 27, 1883.

Wmessem (No Model.) Y 2 Sheets-Sheet 2.

H. C. GROWELL.

DEAD PULLEY RIG. N0.I289,073. Patented Nov. 27, 1883.

AZZ (r N. PETERS. Pmxnimugnpher, wmingvm n.4;

t' U Nrrnn STATES PATENT @erica HILEN C. CROW'ELIJ, OF ERIE, PENNSYLVANIA.

DEAD-PULLEY RIG.

SPECIFICATION forming' part of Letters Patent No. 289,073, dated November 27, 1883.

Application filed May 28, 1883. (No model.) 4

To all whom t oma; concern.-

ley rigs ,.7 and it consists in providing new and improved means for moving the dead-pulley longitudinally on the shaft at the times of shifting the belt off and onto it, and also in providing a new and improved shifting apparatus for shitting the belt and moving the dead -pull ey simultaneously.

My device is illustrated in the accompanying drawings as follows:

Figure lis a perspective view of the rig. Fig. 2 is a vertical longitudinal section through the hub of the dead-pulley, and the devices for supporting and Vmoving it. Fig. Sis a like view of the supporting-box only. Fig. 4 is a side elevation of device for moving the dea-dpulley. Figs. 5 and 6 show details.

The various parts are indicated by letters of reference as follows: A is the shaft. B is the fixed pulley. C is the dead-pulley. C is the elongated hub of the deadpulley. D D is the box in which the elongated hub is supported, of which D is the bor: proper, and l) D the wings by which it is attached upon the hanger, which is not here shown. E E is the wheel by which the dead-pulley is moved longitudinally on the shaft. FF is a canrslot in the sleeve or hub E of the wheel E E. VF is a sliding bar, which lies in a way, F3, on the top of the box D. Fiis a yoke on bar F, which engages with a flange, c, on the hub C". F' is a pin on the bar F, which lies in the cam-slot Ez of the hub E. Di is a yoke, which is secured on the box D, and engages with a flange, e, on 'the hub E.for the purpose of holding the lwheel E E' in place. Gis the shifter-cord. II is the belt, and I the shifterbar.

The manner of operation of dead-pulley rigs of the class to which this invention belongs is as follows: 'When the belt is to be shifted from the dead-pulley, the movement of the shifting-lever first throws the dead-pulley up against` the moving pulley, and thus sets it (the dead-pulley) revolving before the belt is shifted, and after the belt is shifted the deadpulley is drawn away from contact with the other pulley, and again stands dead. In all such devices with which I am acquainted the difficulty has been that if the shifting-lever weremoved quickly the dead-pulley Vwould move up against the other and away again before the belt had time to get off of it fully onto the other pulley, and the result would be a burning of the edge of the belt. In order to shift the belt properly, the shifting-lever must be moved slowly, and this careless workmen are apt not to do. To avoid this by making a rig which can only be moved properly is the principal object of this invention. other difficulty with the old devices is that the cam-slot is in a lever which has to extend from the shaft some distance in the direction of the belt; and it often occurs that the surroundin of the place where the rig is wanted is such that no place can be found for this lever to move in, or the lever has to be placed so as to be in the way of workmen, or other machinery, often making it impossible or impracticable to put up a rig when it is wanted. All these difficulties I wholly avoid by the construction here shown.

The construction and operation of my device are as follows: The elongated hub C is journaled in the box D in such a way that it will have no bearing on the shaft, and so that it can be moved longitudinally in the box. On the hub near the pulley there is a flange, c, with which a yoke, F', can engage for the purpose of giving the pulley the longitudinal movement before referred to. G11 the opposite end of the box. D is journaled the wheel E E. This wheel is moved by a cord which runs over its periphery, which is provided with a V-shaped groove to receive the cord. The hub of this wheel is provided with a ca1n-slot, EL and a flange, e. A yoke, D?, which is se cured to the box D', engages with the flange c, and holds the wheel in place, but allows it Air' IOO

to move rotatively. rhe yoke Di is held in place by set-screws d2 and d', and the side flanges, D3, on the box. By the set-screws d d2 the position of the yoke D2 can be properly adjusted. The cam-slot Freceives a pin, F2,

' on a sliding bar, F,`which is connected with V,sh own.

the yoke F. This bar F lies ina way, F, formed on the box D. As the wheel E E is revolved, the cam-slot will move the bar F. The cam-slot El is so formed as to move the said bar first in one direction, then allow it to stand still and then move it in the opposite di rection. The dwell in this slot maybe as long as desired. Thetwo diagonal parts are abrupt. The length of the dwellwill be varied according to the width of the face ofthe pulleys. For this reason, the incline of the slot at one end moves the dead-pulley up into frictional contact with the fixed pulley, and the incline at the other end of the slot moves it back, and the dwell holds it in contact long enough for the belt to shift; hence the length of the dwell.

should be in accordance with the width ofthe face of the pulley. The wheel E E is moved in one direction to shift the belt onto the fixed pulley, and in the opposite direction to shift it off; but the dead-pulley makes two movements at each operation, as follows: It moves up against the fixed pulley before the belt starts to shift, and away from it when the belt is shifted. The position ot' parts in Fig. l shows the belt partly shifted, and the pin F'l is passing along the dwell ofthe cam-slot. rlhe cord G, which moves the wheel E E', also moves the belt-shifter. rlhis is clearly shown -in Fig. 1. I is the shifter-bar, h h being the Vhang downat the point most convenient for the operator. By pulling the right-hand pull the wheel E will be rotated f'rom the operator, which will shift the belt onto the dead-pulley C, while a pull on the other pull will move the wheel toward the operator and the bar I, so as to shift the belt onto the fixed pulley B.

No supports are shown in the drawings for the sheaves gg g2 gi, but their position is clearly 'sition of these sheaves is that they shall be so vplaced that at least one line of the cord shall pass by the shifting-bar insuch a manner that .it can be operated from said cord.

The only requirement in the dispo- Vhen the eani-slotl2 is made longer than rthe belt or face of the pulley, the proper adjustment to secure the proper shifting of the belt may be made by the pins or catches i t in the cord G.

IVhat I claim asnew isl. In a dead-pulley rig. the combination, substantially as herein shown, .of the following elements: a dead or loose pulley having an elongated hub by which it is supported, a journal-box adjusted concentric with said shaft and adapted, as shown, to receive and form a bearing for said elongated hub, a camwheel mounted at one end of said box, and, finally, gearing, substantially as shown, for moving said hub longitudinally in said boX from said cam-wheel.

2. In a-deadpullcyrig, the combination, substantially as shown, of the following elements: a dead or loose pulley having an elongated hub by which it is supported, a j ournal-box adjusted concentric with the shaft and adapted, as shown, to receive and form a bearing for said hub, a cam-wheel mounted at one end of said box and geared, substantially as shown, to move said hub longitudinallyT in.

said box from its cam, and, finally, a cord for operating said wheel, which is connected with the belt-shifter and moves it at the same time it moves the said cam-wheel.

8. In a dead-pulley rig, the combination, substantially as shown, of the pulley C, having elongated hub C, on which is an annular flange, c, the journal-box D', with a sliding bar, F, adjusted thereon, a yoke, F, connected with said sliding bar and engaging with said flange c, the cam-wheel E E, having camslot E2, engaging with a pin on said barF, and the cord G, adjusted, substantially as shown, with relation to the cam-wheel E E and the beltshifting bar I. v

4. In a dead-pulley rig substantially as herein shown, the combination, with the hub of the loose pulley, of a cain-wheel, 'substair tially as shown, for moving said hub and pulley longitudinally upon the shaft.

5. In a dead-pulley rig substantially as herein shown, the combination. with the hub of the loose pulley, of a cam and a wheel1 for operating to move the said loose pulley longitudinally upon the shaft by said cam.

In testimony whereof I affix my si gnature in presence of two witnesses.

H. C. CROVELL.

Vitnesses:

JNO. K. HALLocK, F. JARneKI.

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